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Thread: Dual Exhaust Conversion

  1. #1
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    Question Dual Exhaust Conversion

    In the not-so-distant future, I am going to install a dual exhaust on my '05 MGM. I will be cutting off the dual exhaust of a junkyard car and pattern a 2.5" exhaust from it. I know there is a dual exhaust kit from Stainless Systems, but I want my exhaust quiet; with cutouts for those summer days in traffic when I need waking up. I will be installing headers maybe next year. I also know from experience that it's easier to install a full exhaust all at once (easier to lay it all out and fit everything together). My budget is making me do this backwards; so the exhaust will be done first; headers later. With that said, I have one question; what role do those weights on the stock exhaust flanges play? When I do the full exhaust, should I weld those weights onto the new flanges? Kinda silly question, but I figured that they are there for a reason.

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    they are there to minimize drone.
    "X" car 89 Colony Park LS Mods>Engine delete, SS duals magnaflow hflow cats, 2010 Must GT mufflers, auto air shocks, Posi, Tran cooler, big front brakes, 03+ rear disks, Large 3g alt, Tripminder, GS grill, 86 seats, 16" HPP wheels, winter boots=96 Cartier wheels, 215-65/16 Goodyear ULTRA GW3 snows, pi rear sway, alum driveshaft.
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  3. #3
    Hobbit
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    Be sure to grab muffler and tail pipe hangers from a donor car.

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    Okay. Thanks for the fast response Jaywish Wish my coworkers were that fast :-/

    I am going to install Dynomax 17748 muffs with some resonated exhaust tips that I got back in the '90s. Hopefully it will be quiet with relatively little drone.

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    JBTW 2.5" might be a bit of overkill. 2.25" if available might be a bit cheaper and easier to work with while providing a great improvement over the stock single and stock duals as well
    "X" car 89 Colony Park LS Mods>Engine delete, SS duals magnaflow hflow cats, 2010 Must GT mufflers, auto air shocks, Posi, Tran cooler, big front brakes, 03+ rear disks, Large 3g alt, Tripminder, GS grill, 86 seats, 16" HPP wheels, winter boots=96 Cartier wheels, 215-65/16 Goodyear ULTRA GW3 snows, pi rear sway, alum driveshaft.
    03 Marauder DPB, HS, 6disk, Organizer, Silver Stars, M&Z rear control arms, Oil deflector.
    02 SL500 Silver Arrow
    08 TC Signature Limited, HID's Mods>235/55-17 Z rated Cooper Zeon RS3-A, Addco 1" rear Sway, Posi, Compustar Remote Start, floor liners, trunk organizer, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17

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    What is the difference between a '98-'02 exhaust and an '03-'11 exhaust? The reason I'm asking is because the '02 CV that I'm pulling the suspension off of has a dual exhaust; unfortunately it's the only Panther in the yard with a dual exhaust. My plan is to cut the exhaust off and use it as a template for the new exhaust. Just wanted to know if they're compatible.

  7. #7
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    Having tried an ‘07 system under my ‘97, everything seems off. The H-Pipe hit the floorboard and the over axle section seemed way tighter. I’d consider the earlier system to be closer related to Aeros. I’d check H-Pipe year compatibility for determination.

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    Okay, that's good to know. I will search for a yard that has '03-'11 Panthers with dual exhaust. Thanks Kodachrome Wolf

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    No mean-spiritedness here. IPreferDIY's Avatar
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    IDK much about exhaust issues, but for me, the extra weight and drag from the weights 'outweighed' any sound benefit. I'll have to wait until I get new exhaust flanges welded on before I know what my car actually sounds like with intake alterations and weight removal without an exhaust leak. A couple of years ago when we still had emissions checks for cars (they stopped in April), I was really blown away by the 'growly/rumbly' sound my car made when I heard the mechanic start it up inside their shop. I haven't been particularly motivated to make it stop sounding like a beast.

    2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
    mods: air filter box "tuba" (in place of the "trumpet"), headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, NKL4 PCM (from a 2000 CVPI, nothing great there apart from highway cruising), KYB Gas-A-Just shocks (after >202,000 km on originals)

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    When I first got the '86 CV (back in '03) I was still in loud mode. My Malibu had 3 modes; single 3" exhaust with glasspack and hi-flo cat (kinda loud); cutout after the cat (loud); unbolt the exhaust flange at the Y-pipe (after the headers - stoopid loud). I was leaning towards quiet when I did the full exhaust on the '86 CV (back in '07); shorty headers, cat'd H-pipe, and decent mufflers with cutouts after the H-pipe (pretty loud for a lopo). After 2 Rangers, a S-10, and my current '05 MGM; I am liking the OEM quiet mode. That's my goal now when I do the full exhaust on the MGM.

  11. #11
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    I think the new subframe on 03+ makes the engine position a little different, thus making the exhaust just a little different. I think the splits are 92-97, 98-02, and 03+. Since the Stainless Works complete exhaust systems make the split at 98-02 and 03+... I think my reasoning is logical. The manifold to down pipes and H pipe should be the same 92-02 while the tails is what changes due to the shock placement I think.

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    ^^^Yes. The 98-02 will be much closer to what you need than 03+ but not dead nuts. Patterning after that MAY work out ok but i think the over-axle pipes may need a little tweek. Far as the drone-reducing weights, don't bother. Mufflers will make much more difference in that. I had cheap ebay shorty headers, a mustang off-road pipe with 2 cats welded in, and impala tailpipes with Moroso Spiral Flow mufflers. On a stock lo-po it was pretty mellow and no drone at all.

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